In a bowl, gently toss the fresh rice noodles with the dark soy sauce. Use a plastic glove to mix them carefully without breaking the noodles.
Heat a wok over high heat.
Add the oil and stir-fry the garlic until golden.
Add the beef and stir-fry until about halfway cooked.
Push everything to one side of the wok and crack the eggs into the empty side.
Gently scramble the eggs, then mix them in with the beef.
Add the sauce ingredients and the noodles. Toss until all the noodles are evenly coated.
Add the Chinese broccoli and onion. Stir-fry until the vegetables are tender-crisp, or cooked to your liking.
Serve immediately.
Notes
Bring the fresh rice noodles to room temperature before cooking. This helps prevent them from sticking together and ensures even stir-frying, so every strand gets nicely coated with sauce.